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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '156c3802a5b304353a983e1a841e6c07581322c6302aefe43e6777a7cd7c37c7' 
  AND token = 'jOKy/RZPVHaxo8TuID9FT8B2GRo1w2GMJoYDasA3Qvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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