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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '09b27acf66f3ff1cc8bcb57a4124bedd169e24ea27060cc1c9e20fcd10e8b994' 
  AND token = 'TAzu/q7r1J4AW+iKWqzFYYlL9OacKDalKO2huDN7K5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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