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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b929c9c4c606c673791ca4d02c708f380455002879f7181f0540cd27d64aa6c1' 
  AND token = 'gKkuGT5J3lUGNSErXi6eakYF8Pec2RAdHMgvAtCQit4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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