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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '412b5ffff95c788570acba181ba88759267d1c6ce0cde71c3f414bacd1b57a00' 
  AND token = '7ThiER5E8ExdyE4REKjnYJT1e4HYkGC4M3CSpL51k6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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