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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26a361b2075273335b1541bf3f96d4f8ba54405ea38903960ba9066e9154dcd3' 
  AND token = 'IhAtymnQLPAhx+/SfZphUbWKi4+ohNS/H1/XkYHpAt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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