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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'faf9a0ecf8f14ef2b420c578e83fc99001b7fc373d265ec24f713350de78e61b' 
  AND token = 'wp9vy/P9kEvOH0R4ZGD3Fib89/lq0hkr41RBCnUQFB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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