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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c11b2ccee30387ae16dee9ac332f1b7424b38108e9212d480878d005decb47b' 
  AND token = '2k3vZZGNEG/os+QZP5qcZkjdIZS6md9neq2R+PB4B64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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