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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0dbdff6f3e35b857d223ce9010083fddd40a99ffccf0332b0797f95d47fe8cc' 
  AND token = 'LnyERPkg98GXpr0ek5cWKQJ61QRDcSsxZWNgMbRKZfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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