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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ea414a465940eebbb0f9bb2147665d96529c31b1b1e12d0af487c520c4ac8e3' 
  AND token = 'cWfrkqhEMkJXuQiDnKASJkuMhcIAPy9xM7CWiWyG0eI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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