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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '455b62d74e85d738b8021a085f5c0f232cc8128a4b03106648b22bc62282c3f3' 
  AND token = 'ITR7Bma3hjC8Z7dBkcfqvofGxNGIEFKhS1C6cX2pbDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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