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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e1f4ec50cc2f81b90ac5c57f02c08d2e941e9dddc41be0bd95339739aa6e6c42' 
  AND token = 'FkSpGUTIlNjgNE7xGqSbXsVujd21G1DqYIegYhUGFZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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