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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ecc01aaeff354f088c3154de1db7179d17d390f2234e145bfc20044609f82d45' 
  AND token = 'DGCla6clYhga1ip1GE3QofocHK5qVASSa7U4A3LYxdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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