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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f08f42aaaa19e91b4f82372c2dda118679114e64a50be3f7f2b23cb0b79897c5' 
  AND token = 'iSXLBNeEcGNkmk5/yb8SGHbp3oHzUsX54sDilEQ+9Bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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