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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ed67e527a71b7f3abff543a4d1d08419d278c9dc1ea1a8c961cb1f177f71f0b' 
  AND token = 'aTpUeMvMF9Ci3W0cCpgZTAdWyvDcFSRTGDNy298I2bA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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