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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b6d78a4bb394f39e17c09390eb2832713d1f4be91e627271115fbfe1a77558a0' 
  AND token = 'Kd1I73rE6hrjq/4U7B3ITD1XKoMroydP3Q3G2T/GcDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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