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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7dc27674deefc50569743ec36fa0fd388de50d9ecd2d7dd40c0e1a3e754cabb6' 
  AND token = 'T0L4ExrF0YF0nG0dk7OL8il8hHzgd1FU+Yq+t2CQaDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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