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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b41391a51b149c360dec01953766f4d707cebc77e2ce002c7dc3d8e8ba13d27' 
  AND token = '2wPqo7cqMd4el9PUy54sjJnqhbB5WigwdpjbRL1YhjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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