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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b93dfab3418c12c2e0afd936072a0a447821bc2a74333b1b4e919030091014c6' 
  AND token = '5x9yXQeS4cw5c0Y+SjMuZL6WJRQSj/iJsLMDJRz/nj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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