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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '57ce6132b5f8fe31ef4012d815a93cb2b02a0ac8a4597334f8dce09395f6e77e' 
  AND token = 'FGXtkzZIrTAvbrEAE2mxttP76lx7YosUgFxDk1JEIkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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