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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7fbcf47209496823d03fa05a0798816c47070094e785bb971a020932705f92ff' 
  AND token = 'HMF5//WYzKoTMG0ejAk5N3Px3Y9e/Nkm0xdkFIxhqFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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