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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae60c5311a0f36aa7e11876ae9769520dac25d26b100c3857cddce248c98c8ce' 
  AND token = 'QlvYSVzvWhGRFh2sXr2jn5JdNlirQAMfXBviAUb3Pbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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