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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c729ada834594f0b665d1dc4f7b4f132b4ced0a2ee900dab1d1f25397e3d8ed' 
  AND token = '1EiX5Y5S34m5NbCls8wuu3+8SRDtyrpne2x2Z5mkRsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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