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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '020d4ad049f702b8823e0ab7d49f6c6ba52dec59d132e1b6a2db13553a41df1c' 
  AND token = 'tE+QnesVc1MGsvuit3CubjBytSQICtMErGQWDPVBWcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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