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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1535e1a8d26dfbe877dab1945cfd732d0390aedc5ae49ed1d4dc2031e859cf1f' 
  AND token = '/Wm2BDSeHHQ8Aei2+scyNAoVo3+METL3Eps0fSCsP10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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