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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7126df1a8cad7d9dab30dfef43e4932837756031d8f83016afe0b1bb1216968c' 
  AND token = '+efmTqJyvBbQOR2NiZsPEa5E27pGPHabjrZ3CLZ9smQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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