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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c39cceee664f3dbde858b59d1352df2f32fdebf182c44de9272417e155020cf' 
  AND token = 'EoQpS8JWfgRmNg48j7gUwI70XQLkI7TzlI5DcywHhr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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