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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66f8e146dc30acbadc7f46e4ed64508085d139c622d1bbb21c5a316e3b8e7f2d' 
  AND token = 'Q1GJRO0ql7V1HHgkkib6XwSVBmU4lwNtGe95zftMkNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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