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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '04d7fb89dfbfb074279eabc856b628591c6330ee5e4fd6ed6665d3b9494ccc17' 
  AND token = 'fmC/mR8bEpnE4P2Fc4xLL8ww+FjS4Av2D6Sh+e/JUMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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