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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '85405039fe06758a4656d0fca2df63b6a238b2c382f97afdf4eb15e129c1ba93' 
  AND token = 'OtZ8pcfyOdM6dA/RTqrtt6XNhvMM7+VxpG6h3Pqo+6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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