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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2260f2474221b87542775c41f84a0e13b13f816f7a4c187948f17410405cc55f' 
  AND token = 'Q8i0ux5oFQY3NaFYePB4kyG6Ep4YLZP6Q/z4hA61+eQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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