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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '75282eccac4a375745982fb447a90296ffe4783899d308f5d0312f1a7604bac0' 
  AND token = 'hsNgS4R9lCCpTxjAwLIa0hV7y94ix1axDD99yF9tmPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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