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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '674a580c3a02603e6f3c994270a4c4f307c11749de83d664ad1c81a41cadd8f6' 
  AND token = 'Q/h/mvuahh9onv+e00RwSF/7s+szk4OiD3z9pbmYWlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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