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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '56ddb6b15db9e79d8cb186b68ee46b0e3a41db21274905ba218db8ebb523a20b' 
  AND token = 'qgCh4GLu2yYd93DZcNxde7vYcljTgnscNXBdYb3IIt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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