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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '558a3a07398c4ffe80e5e3068e1d3586a2eccca79e9f07e8aa5e79d43089b886' 
  AND token = 'zms/NVzX1NAjWWF8TGMv4EWCux7lu6KDZ3d3v6NZ5Qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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