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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e8a955e817270f013cea968dd9a8ef8d3fdf2602a06bfc541f28b8c11c5e574' 
  AND token = 'agrVwk5Ni9sYvmMaUTntFS8YIU+yTA/zw+AwS4iCGrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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