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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66c89706d058abcc03715c8a8dcadbe6d25ef84cd7d2c130d00d6718ec5210ce' 
  AND token = 'sCtFTxagWvqsEXVzekThobSLLpsqyqUZx8IcKLVTMeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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