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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55d44db3e7842b9b7afd9c2ac8adbd77392e131941cd2aecd467b3c20416ef2a' 
  AND token = 'qpD2icbEOuxMbBfLGnHDTjK+r3zjLFEZXWj8kFQFkmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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