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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f030625e92342061e2e0f3d2cfaae5a4e4582296ba4767dc39aedaedeefca0a' 
  AND token = 'nBbMhODTao3W51eJ2rf42e4iJUxQYDEUIe0un0BaF08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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