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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cfbb37f7c3eefe5c4b4c07a3edd07cabbba17645d708d0217bbce2b63f59304b' 
  AND token = 'RgDM1M4rXOut39wDe56nYOEF6YnO8FYB1UuUWpVdrgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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