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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5bdedbd4444c2d9e7ed7b84720e3a44156d71042d5f43ebe5fd6acfbe7b1f1d8' 
  AND token = 'jqL0xO6pC1Xht3cjQeskv+5/gwP7SZfMnTkcDre4jxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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