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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc54b98ebd04f2a9ccf252ec4dad8ab8c45d22b3c8dd21b26d699b1bf9755c86' 
  AND token = 'Q1Px9l0pKnZG4Eipykup+ngAHDN/LRzifgSfIQ0wC20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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