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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '268b10d1b775e9914fe33eadc9a65a9a1cfffab711e39a9d576dc430c631f10e' 
  AND token = 'bNEKoIogychkshxB7aQVB3h4i21qGj6PSgz9KDDP9g0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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