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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa8959c937e609225396618fac738d047b63c3072e31bb4bc2ba1e452deb5c45' 
  AND token = 'rXj5wjSy3YtuNQHUNBEg5I4N974oOFstOAyXGmxmDow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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