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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c6c5b5468914d67577d85a52c792a2f142ed9a53cfb1c71e7a3504c483f2544' 
  AND token = 'LNkSze/Mymj28alya1iPcPLVRISPbC6gxknVhfYP4sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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