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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cadf61ec45a1aec27464cb9f9c742fd21d55fccf9eb6e49ba42bccabbe0ecf62' 
  AND token = 'kNlA89V05Q/RKpDiIAx2QUCJ+fIdSWV6PAyqN1oxrtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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