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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '451e0e2526b99c57c53f26b9391a5fee309a44dc88ddc90aa31900714028598b' 
  AND token = 'axtmOK6w1jmhZOAtp+UEcs4T2ZEbT39LdgD+s0fossw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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