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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ffefff5ce86d1d1d015081f0f9b176a789e08a8b079d39ff50ebda2edc471c48' 
  AND token = '7QhAFKXuRyAXnB2CdKP2t3SRfFNFAW1AVVB4r7Lw5mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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