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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20ee0e3389fa7ebb5d2e5e2e30562285f635c49cee24704838bab30cdae90bea' 
  AND token = 'TbBdSu9wCKLVQ6Z8m0bnFOTm4wFF1V/4JBFRciPDOFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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