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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c7855fcfac17caac372302f3002b3a38c15cf84644d4eff0ce34932e68c3bf77' 
  AND token = 'js6H3ib/GNxH5oHWTI2zZib9ofEQNW+2/e+FL27CJnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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