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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f98ace018c6c377f2a9a89c06d7a9d3ba346c5fb49a76cf2986c1ab4cc939e32' 
  AND token = 'LKkfTxWXXFM/l13CxmHDvGp8C3UW82lWa2/weCyN/kE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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