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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e4ab1aa9ad6e375afe953c7983c091d6141b2debd5637bdd424002df77cdef2' 
  AND token = '5d+70SnUVwCqvUn+dn3faRT5xCMwZmDTKePZYmrpdFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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