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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd3d8816da6e2c78e64228d1809ad3e4a5da1f756b41ad3c773be84af8782705' 
  AND token = 'qcEC0LZUVHmwcGL4HCPxOp8pfT96E56FRaatHGMpLBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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