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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '105b0d0301f5eb76a4e43c5e0095894b745f9b893d7d4791fe1a130f79c1b0f9' 
  AND token = '9ZGnmvpkZlUHOr14Tw69pFq9AtmG35i37DI1Gy3IeHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}