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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fab3a7fe077a7695fc02015ff709d0b5be648fe433b5049331773b7a70636571' 
  AND token = 'jRsF583KXOCXT4/Wr7GzPO9o2hgmJ9K9hG2bi3iF1xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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