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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '84af9fc34008fe970fe7dbfc4e8a6b1ddf661f82e8b2482c150c0fa758fbeda1' 
  AND token = 'nBuik5E58Sb01Krm2KCvrAASuzYQFFIMRl1rYUvZVN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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