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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '53555b7294285331b971cacfb37aafae79c44fd8e724f97e660fdfff0c09429d' 
  AND token = 'Sj86Nzc6Q4eCGFURmb4Q3OXlO3bhU2ES589n0peLGhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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