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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e77f1641e567f04b89f187c10837d5a7f1018c142033d50daecbf868aed2eea' 
  AND token = 'GJ44mEfdduG37x04WyzIqxmTojJhXNIlLLmYUHT+YeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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